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In 1967, Robin and Nigel discovered that the Halliwell Manor was built over a spiritual Nexus. She befriended Penny Halliwell in an attempt to gain access to the manor. The two helped plan a "magical be-in," and invited several of their witch friends to come so they could tap into the Nexus' power. However, Robin and Nigel planned to massacre all of the witches there and take the Nexus' power for themselves.
Penny suspected that evil forces might try to disrupt the "be-in," and had everyone take and bless crystals to ward it off.

Robin then found an excuse to sneak to the attic so she could unleash evil in the manor before the crystals could be deployed. Penny's husband, Allen, walked in on Robin in the midst of her chanting; he'd noticed she was acting strangely. Robin then killed him with a fireball. Penny flew into a rage at the sight of her husband's body, and killed Robin on the spot. Penny had been a pacifist for some time, but Allen's death at Robin's hand turned her into the dedicated demon and warlock hunter she remained for the rest of her life.

Almost thirty-seven years later, Paige Matthews, who had been sent back to 1967 after putting on a pair of go-go boots Grams had enchanted, walked in on Robin as she was about to kill Allen, and temporarily distracted her. Allen tried to talk Robin into renouncing evil, but only succeeded in making Robin angrier. Paige knocked over some marbles as Robin was about to throw another fireball. Robin was knocked off her feet and killed by her own fireball, temporarily disrupting the timeline. ("Witchstock")